MOTOROLA SN74LS280D, SN74LS280DR2, SN74LS280M, SN74LS280MEL, SN74LS280ML1 Datasheet
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Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1 Publication Order Number:
SN74LS280/D
SN74LS280
9-Bit Odd/Even Parity
Generators/Checkers
The SN74LS280 is a Universal 9-Bit Parity Generator/Checker. It
features odd / even outputs to facilitate either odd or even parity. By
cascading, the word length is easily expanded.
The LS280 is designed without the expander input implementation,
but the corresponding function is provided by an input at Pin 4 and the
absence of any connection at Pin 3. This design permits the LS280 to
be substituted for the LS180 which results in improved performance.
The LS280 has buffered inputs to lower the drive requirements to one
LS unit load.
• Generates Either Odd or Even Parity for Nine Data Lines
• Typical Data-to-Output Delay of only 33 ns
• Cascadable for n-Bits
• Can Be Used To Upgrade Systems Using MSI Parity Circuits
• Typical Power Dissipation = 80 mW
14 13 12 11 10 9
123456
8
7
V
CC
FEDCBA
G H NC I ∑
EVEN
GND
FEDCB
AG
HI
INPUTS
INPUT
OUTPUTS
∑
ODD
∑
EVEN∑ODD
INPUTS
FUNCTION TABLE
NUMBER OF INPUTS A
OUTPUTS
THRU 1 THAT ARE HIGH
∑EVEN ∑ODD
0, 2, 4, 6, 8 H L
1, 3, 5, 7, 9 L H
H = HIGH Level, L = LOW Level
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 4.75 5.0 5.25 V
T
A
Operating Ambient
T emperature Range
0 25 70 °C
I
OH
Output Current – High –0.4 mA
I
OL
Output Current – Low 8.0 mA
LOW
POWER
SCHOTTKY
Device Package Shipping
ORDERING INFORMATION
SN74LS280N 14 Pin DIP 2000 Units/Box
SN74LS280D 14 Pin
SOIC
D SUFFIX
CASE 751A
http://onsemi.com
2500/Tape & Reel
PLASTIC
N SUFFIX
CASE 646
14
1
14
1
SN74LS280
http://onsemi.com
2
A
B
C
D
E
F
G
H
I
(8)
(9)
(10)
(11)
(12)
(13)
(1)
(2)
(4)
(5)
(6)
∑
EVEN
∑
ODD
FUNCTIONAL BLOCK DIAGRAM
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
V
IH
Input HIGH Voltage 2.0 V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
V
OH
Output HIGH Voltage 2.7 3.5 V
VCC = MIN, IOH = MAX, VIN = V
IH
or VIL per Truth Table
p
0.25 0.4 V IOL = 4.0 mA
VCC = VCC MIN,
VOLOutput LOW Voltage
0.35 0.5 V IOL = 8.0 mA
V
IN
=
V
IL
or
V
IH
per Truth Table
p
20 µA VCC = MAX, VIN = 2.7 V
IIHInput HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
I
OS
Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
I
CC
Power Supply Current 27 mA VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T
A
= 25°C, VCC = 5.0 V)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
t
PLH
t
PHL
Propagation Delay , Data to Output
ΣEVEN
33
29
50
45
ns
p
t
PLH
t
PHL
Propagation Delay , Data to Output
ΣODD
23
31
35
50
ns
C
L
= 15
pF
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